EP2274002B1 - Leucine-rich peptide compositions and methods for isolation - Google Patents

Leucine-rich peptide compositions and methods for isolation Download PDF

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Publication number
EP2274002B1
EP2274002B1 EP09724382.8A EP09724382A EP2274002B1 EP 2274002 B1 EP2274002 B1 EP 2274002B1 EP 09724382 A EP09724382 A EP 09724382A EP 2274002 B1 EP2274002 B1 EP 2274002B1
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leucine
peptides
protein
rich
compositions
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EP2274002A2 (en
EP2274002A4 (en
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Loren Ward
Brent Petersen
Stanley Wrobel
Eric Bastian
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Glanbia Nutritionals Ireland Ltd
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Glanbia Nutritionals Ireland Ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A61K38/01—Hydrolysed proteins; Derivatives thereof
    • A61K38/012—Hydrolysed proteins; Derivatives thereof from animals
    • A61K38/018—Hydrolysed proteins; Derivatives thereof from animals from milk
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
    • A23L33/17—Amino acids, peptides or proteins
    • A23L33/175—Amino acids
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
    • A23L33/17—Amino acids, peptides or proteins
    • A23L33/18—Peptides; Protein hydrolysates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
    • A61K31/19—Carboxylic acids, e.g. valproic acid
    • A61K31/195—Carboxylic acids, e.g. valproic acid having an amino group
    • A61K31/197—Carboxylic acids, e.g. valproic acid having an amino group the amino and the carboxyl groups being attached to the same acyclic carbon chain, e.g. gamma-aminobutyric acid [GABA], beta-alanine, epsilon-aminocaproic acid or pantothenic acid
    • A61K31/198—Alpha-amino acids, e.g. alanine or edetic acid [EDTA]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/02—Nutrients, e.g. vitamins, minerals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P7/00—Drugs for disorders of the blood or the extracellular fluid
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • A61P9/08—Vasodilators for multiple indications
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • A61P9/10—Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • A61P9/12—Antihypertensives
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P21/00—Preparation of peptides or proteins
    • C12P21/06—Preparation of peptides or proteins produced by the hydrolysis of a peptide bond, e.g. hydrolysate products
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs

Definitions

  • the invention relates to dietary peptide compositions for stimulating protein synthesis, decreasing protein degradation, producing vasodilation, increasing nitric oxide production, and decreasing blood flow. More specifically, the invention relates to leucine-rich peptide compositions and methods for their isolation from proteins.
  • Leucine also stimulates muscle protein synthesis and modulates the activity of various proteins involved in the control of mRNA translation. Leucine may stimulate protein synthesis directly or through its metabolite, ⁇ -ketoisocaproic acid. Leucine may stimulate translation either independently or by interaction with the mammalian target of rapamycin (mTOR).
  • mTOR mammalian target of rapamycin
  • Leucine is one of the branched-chain amino acids and is an essential amino acid. It is the only amino acid that is converted to acetyl-coenzyme A and alpha-ketoacids and is an important source of nitrogen for synthesis of glutamine. In addition to its effects on protein synthesis and degradation, leucine also stimulates glucose uptake by protein kinase C (PKC), while insulin modulates glucose uptake via protein kinase B.
  • PKC protein kinase C
  • Milk-derived whey is one good source of muscle-building proteins.
  • Whey protein isolates and whey protein concentrates are used in protein-building dietary supplements.
  • Whey proteins are a good source of leucine, but for many individuals who need the muscle-building amino acids dietary proteins can provide, it is difficult to digest and/or absorb proteins. It is therefore important to find ways to provide leucine-containing amino acid compositions that provide amino acids in a more bioavailable form for improving muscle protein synthesis.
  • the present invention relates to peptides having a leucine content of from about 12% to about 40% ("leucine-rich peptides”), those peptides being isolated from a protein source by a method comprising the steps of hydrolyzing the protein in the presence of one or more leucyl aminopeptidases, optionally in combination with additional proteases, to produce a protein hydrolysate, deactivating the enzymes, and filtering the protein hydrolysate to provide a permeate comprising peptides having a molecular weight of from about 200 to about 4,000, including sub-ranges in-between, such as, for example, a molecular weight of from about 200 to about 1,000 or a molecular weight of from about 400 to about 1,000.
  • leucine-rich peptides those peptides being isolated from a protein source by a method comprising the steps of hydrolyzing the protein in the presence of one or more leucyl aminopeptidases, optionally in combination with additional proteases, to produce
  • the step of concentrating the leucine-rich peptides by removing the aqueous fluid from the permeate may be added.
  • method of use of such peptides for a variety of beneficial effects such as producing vasodilation, increasing nitric oxide production, decreasing blood pressure, increasing blood flow, increasing muscle tissue, improving wound healing, and improving cognitive function.
  • the invention also relates to a method for isolating leucine-rich peptides from a protein source, the method comprising the steps of hydrolyzing the protein in the presence of one or more leucyl aminopeptidases, optionally in combination with additional proteases, to produce a protein hydrolysate, deactivating the enzymes, filtering the protein hydrolysate to provide a permeate, and concentrating the permeate containing the leucine-rich peptides.
  • the protein may be derived from animal or plant sources, including, for example, legumes such as soy or pea, fish, meat, milk, blood, egg, corn, wheat gluten, maize, or combinations thereof.
  • the protein source may be bovine milk, bovine whey, whey protein concentrates, and/or whey protein isolates.
  • the leucine content of the leucine-rich peptides may be within various subranges of the about 12 to about 40 percent range, such as, for example, from about 12 to about 30 weight percent leucine, from about 15 to about 20 weight percent leucine, from about 15 to about 25 weight percent leucine, and from about 20 to about 25 weight percent leucine.
  • leucine-rich peptides may be isolated from a protein source by a method comprising the steps of hydrolyzing the protein in the presence of one or more leucyl aminopeptidases, optionally in combination with additional proteases, to form a protein hydrolysate, deactivating the enzymes, filtering the protein hydrolysate to isolate leucine-rich peptides, and concentrating the leucine-rich peptides.
  • the method comprises hydrolyzing the protein in the presence of one or more aminopeptidases which may act as leucyl aminopeptidases (leucine aminopeptidases), optionally supplemented with additional proteases, to form a protein hydrolysate, deactivating the enzymes, filtering the protein hydrolysate using ultrafiltration, nano-filtration, or another suitable filtration method to give a permeate containing the leucine-rich peptides, and concentrating the leucine-rich peptides in the permeate using reverse osmosis, evaporation, or another suitable method for concentrating the peptides by removing the aqueous portion of the permeate from the filtration step.
  • the invention also provides compositions comprising leucine-rich peptides prepared by the method.
  • Leucine appears to have a number of beneficial effects, including stimulation of muscle protein synthesis and suppression of the rate of myofibrillar protein degradation and muscle weight loss.
  • Leucine also increases hypothalamic mTOR signaling and decreases food intake and body weight ( Cota, D. et al. Science (2006) 312: 927-930 ).
  • Leucine administration increases leptin levels, and leptin is known to promote lipolysis in adipose tissue, but has no apparent effect on lean tissue. Increased leptin levels result in decreased hunger, decreased food consumption, and increased cellular energy expenditure.
  • Protein sources such as standard whey protein hydrolysates may contain as much as 10% leucine, but given the variety of beneficial effects of this amino acid and the fact that it is not synthesized in the body from other amino acids, it has been a goal of the food and nutritional supplement industry to develop ways to increase leucine levels in order to promote its beneficial effects, especially its effects on muscle building and inhibition of muscle wasting.
  • the present invention provides amino acid compositions that are rich in leucine and such compositions may be isolated from readily-available protein sources using the method of the invention.
  • leucine aminopeptidase to process whey proteins to produce bioactive/bioavailable leucine-containing peptides which they have demonstrated to have a variety of desirable effects.
  • Leucine residues appear to play an important role in the distinction between the effects of remarkably similar proteins.
  • Angiotensin I differs from Angiotensin II by two additional carboxyl-terminal amino acids-histidine and leucine.
  • Met-enkephalin a neuropeptide, has many similar effects to those of Leu-enkephalin, which appear to be mediated by the aromatic side-chains of the amino acids in the peptides. Both peptides consist of 5 amino acid residues.
  • Met-enkephalin and Leu-enkephalin differ, however, in the carboxyl-terminal fifth amino acid residue. In Met-enkephalin, it is methionine. In Leu-enkephalin it is leucine. Both appear to have effects on arterial blood pressure and vasodilation, but in this area the amino acid difference appears to be more significant, with Leu-enkephalin appearing to have a stronger effect ( Moore, R.H. and D. Dowling, "Effects on Intravenously Administered Leu- or Met-Enkephalin on Arterial Blood Pressure," Regulatory Peptides (1980) 1(2): 77-87 ).
  • hydrolysates containing a significant percentage of leucine present as a free amino acid While others have provided hydrolysates containing a significant percentage of leucine present as a free amino acid (see, for example, U.S. Patent Number 6,875,456 to Delest, V. et al .), the present invention provides small peptides (e.g., a hydrolysate containing a significant percentage of di- and tri-peptides) to deliver leucine in a more bioavailable/bioactive form.
  • small peptides e.g., a hydrolysate containing a significant percentage of di- and tri-peptides
  • These peptides have demonstrated surprising beneficial results, such as potent inhibition of angiotensin converting enzyme (ACE) inhibition, vasodilation, and stimulation of increased nitric oxide production.
  • ACE angiotensin converting enzyme
  • Leucine-rich peptide compositions of the present invention provide leucine in combination with other amino acids, but provide increased amounts of leucine in relation to the other amino acids. These compositions may readily be added as a powder to a drink formulation, to a food product, to a nutritional supplement composition such as a tablet, capsule, or other formulation, or to a pharmaceutical preparation, for example. Additional flavorings, carbohydrates, fats, proteins, vitamins, minerals, and other suitable food or supplement ingredients may be included in such compositions.
  • Peptides of the invention may be used to provide compositions that provide a benefit to a human or animal in areas including, but not limited to, cardiac health, sarcopenia, endothelial function, maintaining healthy blood pressure or lowering blood pressure, vasodilation, muscle growth and development, sports nutrition, infant nutrition, prevention or treatment of metabolic syndrome, cognitive function, eye health, diabetes, improvement in glycemic index, mTOR activation, wound healing, and skin care/treatment of skin disorders.
  • compositions of the present invention provide increased levels of the branched-chain amino acid (BCAA) leucine, in conjunction with other amino acids in a form that may be readily incorporated into tablets, capsules, food products such as, for example, nutrition bars, supplements in the form of powders, drink mixes, and other compositions for human and/or animal consumption.
  • BCAA branched-chain amino acid
  • compositions may provide a benefit for those individuals who desire to improve their cognitive performance.
  • Studies performed with the peptides of the invention have demonstrated that supplementation with leucine-rich peptides promotes vasodilation and increases blood flow, as well as increasing the rate at which glucose is delivered to the tissues. Older individuals, students, and others may derive a particular benefit from foods, drinks, and/or supplements comprising leucine-rich peptides of the invention.
  • Metabolic syndrome (Syndrome X) is a chronic disease that affects at least 1 in every 5 adults in the United States. It is often associated with obesity, but the defining characteristic is abnormal glycemic control (glucose intolerance, insulin resistance). Protein-rich diets, especially those comprising significant amounts of leucine, are beneficial for the treatment of obesity and for the treatment of the metabolic syndrome ( Layman, D.K. and D.A. Walker, J. Nutr. (2006) 136: 319S-323S ). Compositions of the present invention provide an excellent means by which the necessary amino acids and the higher amounts of leucine necessary to affect weight management and the metabolic syndrome may be provided to a human or animal.
  • Products such as "protein water” water containing whey protein isolate in combination with sweeteners and flavorings
  • Snack foods, nutrition bars, drinks, drink mixes, and other products may also be formulated with the leucine-rich peptides to provide compositions for use in weight management and loss of fat.
  • Leucine-rich peptide compositions may be used to promote weight loss by incorporating those compositions into one or more food products, or may be similarly used by incorporating them into a nutritional supplement or nutritional drink for ingestion at mealtime.
  • Between-meal-snacks may also be formulated with leucine-rich peptide compositions to decrease hunger and food consumption.
  • Leucine-rich peptides of the invention may be added to whey compositions, whey protein isolates, whey protein concentrates, and other protein sources to improve muscle synthesis, decrease muscle breakdown, decrease hunger and food consumption, improve blood flow, and increase nitric oxide production in the blood vessels, for example. These effects may be beneficial for a large population of individuals, including those who voluntarily wish to build additional muscle mass, those who are losing muscle mass through the process of aging and/or injury, disease (e.g., sepsis, cancer) or malnutrition, and those who desire to decrease the percentage of adipose tissue to muscle mass in the body.
  • disease e.g., sepsis, cancer
  • Leucine-rich peptide compositions of the present invention are especially beneficial for aging individuals or others with sarcopenia.
  • human muscle mass decreases.
  • the frailty that is associated with aged individuals may be attributed in large part to this loss of muscle mass, and that predisposes those individuals to further disease or injury.
  • Some of the muscle tissue loss in older individuals may also be the result of malnutrition-especially in terms of protein ingestion, as protein-rich foods may tend to be more expensive and less readily available to individuals on fixed incomes.
  • Compositions of the present invention provide nutritional supplements with which to address the needs of individuals in whom aging or malnutrition has induced muscle loss.
  • Body-building involves the combination of nutritional supplementation and exercise to increase muscle mass.
  • Compositions of the present invention are ideally suited for body-building nutritional supplements.
  • Leucine-rich compositions stimulate muscle synthesis while generally decreasing the desire to overeat and gain fat tissue.
  • dietary leucine supplementation has been shown to significantly improve endurance performance ( Crowe, M.J. et al., Eur. J. Appl. Physiol. (2006) 97(6): 664-72 ).
  • Leucine has demonstrated cardioprotective effects, in addition to its many other beneficial effects. For example, leucine protects heart muscle against myocardial ischemia and some researchers believe it is also an anti-arrhythmic factor ( Gabrys, J. et al. (2002) Pharmacology Reviews and Communications 12: 101-108 ). Peptides of the present invention have been shown to act as potent angiotensin converting enzyme (ACE) inhibitors.
  • ACE angiotensin converting enzyme
  • compositions of the invention may be provided or consumed as dietary supplements and/or pharmaceutical compositions for maintaining healthy blood pressure levels and for decreasing blood pressure in individuals who have or are predisposed to elevated blood pressure levels. Such compositions may be especially beneficial for individuals who are diabetic, for example, who may have or be predisposed to high blood pressure and who may also need the increased blood flow to tissues in order to decrease tissue damage, especially in the extremities.
  • Leucine supplementation has been determined to be more beneficial than is generic supplementation with BCAAs for burn, trauma, and sepsis patients ( DeBandt, J. and L Cynober, J. Nutr. (2006) 136: 308S-313S ). Furthermore, leucine has an anabolic effect on proteins in skin wounds and muscle, provided that adequate additional amino acids are available. When compared with leucine supplementation alone, leucine supplementation in conjunction with protein supplementation provided a greater benefit for wound healing ( Zhang, X. et al., J. Nutr. (2004) 134: 3313-8 ).
  • compositions of the present invention provide peptides having enhanced leucine content and are therefore excellent food, pharmaceutical, or nutritional compositions for administration to patients with burns or other skin wounds, muscle injury, trauma, sepsis, and other conditions in which the beneficial effects of leucine may be enhanced by providing leucine in combination with peptides or proteins.
  • These compositions may be provided in oral form, via intravenous means, or by injection.
  • Leucine-rich peptide compositions may also be used either orally or topically to enhance skin tone and suppleness, and to promote overall skin health.
  • Leucine-rich peptides may also provide a benefit for blood pressure regulation and inhibition of angiotensin converting enzyme (ACE).
  • ACE angiotensin converting enzyme
  • leucine-rich peptides of the invention may be consumed in food products, drinks and drink mixes, as food supplements such as tablets, capsules, powders, and other formulations that may be easily self-administered at or between mealtimes.
  • compositions of the invention may provide a benefit by increasing microcirculation, promoting endothelial health, and improving nutrient delivery to the tissues.
  • NO relaxes smooth muscle and inhibits vascular inflammation, inhibiting endothelial cells lining the blood vessels from releasing inflammatory substances. NO inhibits smooth muscle cell migration and proliferation and decreases platelet adherence and aggregation. These effects may be especially beneficial in those predisposed to the development of atherosclerosis and to stroke, autoimmune disease, etc. NO appears to regulate vascular inflammation in part by inhibiting exocytosis of Weibel-Palade bodies, which can be triggered by thrombin, histamine, fibrin, complement, leukotrienes, and ATP, for example ( Matsushita, K. et al. Cell (2003) 115: 139-150 ).
  • compositions of the invention may therefore provide a benefit by preventing the development of atherosclerotic lesions, decreasing vascular inflammation, decreasing platelet adherence and aggregation, etc.
  • Compositions of the invention may therefore provide supplements that provide a significant benefit in strengthening the cardiovascular system, decreasing inflammation in the circulatory system, preventing the development of plaques in the blood vessels, and providing a more "heart-healthy" environment within the blood vessels in general.
  • the method may be used to isolate leucine-rich peptides from any source comprising leucine-containing proteins.
  • sources may include, but not be limited to, wheat gluten, maize/corn protein isolates, egg proteins, soy and other legume proteins (e.g., pea), fish, meat, blood/blood proteins, and milk proteins.
  • leucine-rich peptides is milk-derived whey, such as, for example, bovine milk-derived whey, whey protein isolates, and/or whey protein concentrates.
  • Whey protein isolates generally have a protein content of at least about 90 weight percent, while whey protein concentrates may have from at least about 35 weight percent to about 80 weight percent protein.
  • Leucyl aminopeptidases are exopeptidases which hydrolyze the peptide bond adjacent to a free amino group and react most rapidly with leucine-containing peptides and proteins.
  • filtration molecules are selectively passed through or transported across a membrane, and this process may be even more effective when a pressure gradient is used. Filtration is particularly effective at isolating the leucine-rich peptides.
  • Methods of filtering molecules based upon molecular weight and other properties are known to those of skill in the art and include membrane filtration generally, ultrafiltration, and nano-filtration, for example.
  • the isolated leucine-rich peptides are generally contained within a permeate, which is fairly low in solids.
  • the permeate may then be concentrated to increase the percentage of solids in the composition by removal of liquid (aqueous fluid). This may be done by means known to those of skill in the art, including but not limited to processes such as evaporation and reverse osmosis.
  • a high protein, low fat, low lactose liquid whey protein isolate product was used as the beginning substrate. This product was pumped into reaction tanks at a solids level of 17%. The temperature was raised to 45°C and pH adjusted to 7.3 with sodium hydroxide. A blend of proteases and aminopeptidases (e . g ., leucine aminopeptidase) was then added at a level of 0.35% of the solids. Hydrolysis was allowed to proceed for a 6-hour period with hourly pH adjustments to maintain the pH at 7.3. The enzymes were then deactivated by heating the solution to 65°C.
  • proteases and aminopeptidases e . g ., leucine aminopeptidase
  • Fractionation was performed using filtration, the hydrolysate being passed through the filter to retain molecules having a molecular weight of greater than 20,000.
  • the permeate coming from filtration system contained the leucine peptides, having approximately 52% of the peptides in the molecular weight range of less than 1,000; 41 % of the peptides in the molecular weight range of 1,000 to 4,000; and 6% of the peptides in the molecular weight range of 4,000 to 20,000. These peptides were further concentrated using reverse osmosis. The final product was then dried and packaged.
  • Table 1 Analysis of six preparations (lots) of peptides of the invention is shown in Table 1, where Lot 06-187, Lot 06-257, and Lot 06-259 are small-scale lots and Lot 07-041, Lot 07-046, and 07-055 are large-scale production lots.
  • the degree of hydrolysis of each lot is shown on the bottom row, with a range of hydrolysis of from about 30% to about 50% producing the desired peptides in these experiments.
  • ACE inhibition is shown as the amount of peptide needed to produce 50% ACE inhibition.
  • the peptide product was produced by Glanbia Nutritionals, Twin Falls, ID. A single dose of 5 g was premeasured and placed in individual packets with artificial sweetener. Individuals participating in the study were provided with a 2-week supply and instructed to consume one packet per day mixed in 300 mL water.
  • Post-ingestion FMD and FBF measurements were made intermittently. Blood samples were obtained at 15, 30, 45, 60, 90, and 120 minutes post-ingestion. Subjects rested in a comfortable position for the entire duration of the test. To ensure standardization between testing trials subjects were asked to maintain their current level of physical activity during the study period and to repeat their dietary intake from previously recorded diet records the day prior to each vascular testing visit.
  • Flow mediated dilation (FMD) was assessed using standardized procedures for performing high-frequency ultrasonographic imaging before (PRE) and at 30, 60, and 90 min after ingestion of the test beverage. The technique provokes the release of nitric oxide, resulting in vasodilation that can be quantitated as an index of vasomotor function.
  • the cuff was inflated to 200 mm Hg for 5 min using a rapid cuff inflator (Hokanson E20, Bellevue, WA, USA) to occlude the brachial artery, and then released. Arterial diameter was then assessed continuously for 300 heart beats after occlusion. Images of the brachial artery were obtained using an Acuson 13.0-MHz linear array transducer and an Aspen cardiac ultrasound system (Acuson Corp, Elmwood Park, NJ).
  • Forearm blood flow was measured in the same right arm using venous occlusion strain gauge plethysmography.
  • the increase in forearm volume was measured after blocking the venous efflux by an upper arm cuff inflated to 50 mmHg by a rapid cuff inflator (Hokanson E20, Bellevue, WA, USA) for 7 seconds during each 15-second cycle to determine resting forearm blood flow (R-FBF).
  • YSI glucose/lactate analyzer YSI 2300 STAT, Yellow Springs, OH
  • ELISA Diagnostic Systems Laboratory (DSL), Webster, TX]
  • ACE inhibition assay has been previously described by Cushman and Cheung ( Cushman, D.W. and Cheung, H.S., Biochem. Pharmacol. (1971) 20: 1637 ). Briefly, substrate was prepared by dissolving 21.475 mg of Hip-His-Leu ("HHL," Sigma, St. Louis, Missouri) in 8 ml of phosphate buffered saline, with volume adjusted to 10 ml and final pH to 8.3. A 10% w/w solution of peptide composition was prepared using buffer as diluent. Angiotensin-converting enzyme stock solution was prepared by diluting 0.1 unit of ACE (rabbit lung, Sigma Chemical, St. Louis, Missouri) with buffer.
  • HHL Hip-His-Leu
  • Angiotensin-converting enzyme stock solution was prepared by diluting 0.1 unit of ACE (rabbit lung, Sigma Chemical, St. Louis, Missouri) with buffer.

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EP09724382.8A 2008-03-26 2009-03-26 Leucine-rich peptide compositions and methods for isolation Active EP2274002B1 (en)

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JP (2) JP5750039B2 (zh)
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US20140171378A1 (en) * 2008-03-26 2014-06-19 Brent Petersen Leucine-Rich Peptide Compositions and Methods for Isolation

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US9445622B2 (en) * 2009-12-21 2016-09-20 Glanbia Nutritionals (Ireland) Ltd. Compositions and methods for improving creatine solubility and stability
US20110233469A1 (en) * 2009-12-21 2011-09-29 Brent Petersen Leucine/Peptide Composition and Method of Formulation
CN102669683A (zh) * 2011-03-09 2012-09-19 广州加原医药科技有限公司 海洋鱼多肽在制备缓解视疲劳保健食品的应用
CN103014111B (zh) * 2012-12-13 2014-11-12 内蒙古伊利实业集团股份有限公司 一种富含精氨酸的乳清蛋白水解物及其制备方法
US20180023110A1 (en) * 2015-01-30 2018-01-25 Jiangsu University Method for preparing functional polypeptide through multimode ultrasonic enhancing enzymolysis
FR3034317B1 (fr) * 2015-03-31 2018-09-14 International Nutrition Research Company Composition pour le traitement d'un etat metabolique pathogene du microbiote intestinal et des maladies derivees
US10188135B2 (en) 2015-11-04 2019-01-29 Stokley-Van Camp, Inc. Method for inducing satiety
CN111989267B (zh) * 2018-04-18 2022-06-03 三菱综合材料株式会社 多晶硅的包装方法、多晶硅的双重包装方法及单晶硅用原料制造方法
JP2020097537A (ja) * 2018-12-18 2020-06-25 キリンホールディングス株式会社 脳血流を増加させるための組成物
CN115886076B (zh) * 2022-11-26 2024-04-19 黑龙江飞鹤乳业有限公司 含亮氨酸类蛋白反应产物的组合物及在抗肌肉衰减的应用

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US9222117B2 (en) * 2008-03-26 2015-12-29 Glanbia Nutritionals (Ireland) Ltd. Leucine-rich peptide compositions and methods for isolation

Also Published As

Publication number Publication date
US20140171378A1 (en) 2014-06-19
AU2009228250B2 (en) 2015-03-19
CA2719857A1 (en) 2009-10-01
US20160143983A1 (en) 2016-05-26
US9222117B2 (en) 2015-12-29
US20090264363A1 (en) 2009-10-22
EP2274002A2 (en) 2011-01-19
JP5750039B2 (ja) 2015-07-15
AU2009228250A1 (en) 2009-10-01
JP6227519B2 (ja) 2017-11-08
CN102014947A (zh) 2011-04-13
JP2015110573A (ja) 2015-06-18
JP2011517450A (ja) 2011-06-09
WO2009120837A2 (en) 2009-10-01
EP2274002A4 (en) 2012-04-25
CA2719857C (en) 2019-08-06
WO2009120837A3 (en) 2009-12-30
CN102014947B (zh) 2016-10-19
PL2274002T3 (pl) 2015-06-30

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